Re: Mad Men season 6 (spoilers)
^ Seeing Don's attempted domination of Sylvia as an attempt to replace his increasing loss of control in his business life makes sense. More sense than my original thought that he was just wanting to avoid a messy entanglement that could potential damage his own marriage. I have to admit it's much more "Don" that he would be motivated by his own pathological need for control than by some heretofore latent sense of "doing the right thing" (re Sylvia and Arnold).
"There are two means of refuge from the miseries of life: music and cats." - Albert Schweitzer